What a great condo you have!
Guests searching for accommodations are prompted by Airbnb to send out more inquiries for just in case, so they send out more inquiries. And after they get the booking they want, they 'forget' to re-connect.
And yes, it's annoying when they don't respond back. But something that can't be changed.
I used to feel like you in my first year of hosting too!
Now, I've gotten shorter in my replies, and if it's already been detailed in my text I'll refer them to that.
Like: " it's not far at all from the center - if you take a look at my topographical photos and under 'location' in my listing you'll find very detailled info."
And if I pre-approve them might add "I've pre-approved you (not a reservation though), so in case you wish to finalize booking you can do so automatically, unless another booking comes in earlier."
Regarding Instant Book -
I'd be EXTREMELY carefull with that since somebody can automatically book without going through you first - means you do not have ANY control with who books because you can't 'screen' them beforehand through a conversation!
And don't expect that they have automatically read your listing or house rules either! (many guests don't take the time)
There are a lot of hosts who have had good experiences, but I've read a lot more horrifying stories. Esp. with newer Airbnb hosts.
As to your cutlery and other things - I wonder if it wasn't less stressful for you to lock away your nice stuff and leave some IKEA things for the guests? Always expect breakage or damage, and being very particular about my stuff myself, I wouldn't want that heartbreak...
IKEA (or any similar company) isn't expensive, yet tasteful and even fits in a suave environment. And the neutral style of IKEA for example, can even be nicer for guests instead of the sometimes very particular tastes of other people.
Re. electricity - maybe consider bumping up your cleaning charges? Better than adding that restriction in your listing. Under house rules add that they use electricity (+ other utilities?) responsibly. Maybe hang up an extra note in the house with the house rules and highlight the really important points.
Good luck and happy hosting!